Justo Puerto Antonio M. Rodríguez-Chía Arie Tamir Minimax Regret Single-Facility Ordered Median Location Problems on Networks. 77-87 2009 21 INFORMS Journal on Computing 1 http://dx.doi.org/10.1287/ijoc.1080.0280 db/journals/informs/informs21.html#PuertoRT09